File: mo-glyph-height-with-default-font.html

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<!DOCTYPE html>
<html class="reftest-wait">
  <head>
    <meta charset="UTF-8">
    <title>mo glyph height with default font</title>
    <meta name="assert" content="Verify operators with default fonts are not too tall.">
    <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1219068"/>
    <link rel="match" href="mo-glyph-height-with-default-font-ref.html"/>
  </head>
  <body>
    <math style="position:absolute; top: 0; font-size:1em;  z-index: 0;" display="block">
      <mrow>
        <mo>|</mo>
        <mrow>
          <mi>f</mi>
          <mrow>
            <mn>(</mn>
            <mi>x</mi>
            <mn>)</mn>
          </mrow>
          <mn>−</mn>
          <mrow>
            <mi>f</mi>
            <mrow>
              <mn>(</mn>
              <msub>
                <mi>x</mi>
                <mn>0</mn>
              </msub>
              <mn>)</mn>
            </mrow>
          </mrow>
        </mrow>
        <mo>|</mo>
      </mrow>
    </math>
    <div id="hider"
         style="position:absolute; top:0; left:0; background-color:green;
                height:1em; width:100%; z-index:1; padding-top:5px;
                padding-bottom:5px; visibility:hidden" />
    <script>
      function obscureMathML() {
          var hider = document.getElementById("hider");
          hider.style.visibility="visible";
          // The math should now be completely obscured

          document.documentElement.removeAttribute("class");
      }
      window.addEventListener("TestRendered", obscureMathML);
    </script>
  </body>
</html>